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Thanks guys, you're right, I tried last night but the no-contact tester method didn't work as it couldn't detect a current through the thick outer cable, even on the ones which were definitely live.

I'll try it again tonight with by switching the off-peak switch fuses off one at a time. Ideally need access to the neighbour's flat so I can see what is happening at their CU as well. Will ask the landlords if they'll lend me a spare key, so they don't have to come out before 7.30am!